Hi,

The first thing I would do is to see if your system boots using just the 512 DDR you DIDN'T remove. If it does, then I'd switch the DDR's and try again. If the system won't boot, then you've damaged the DDR. BE SURE TO USE A GROUNDING STRAP AROUND YOUR WRIST TO KEEP YOU GROUNDED WHEN WORKING WITH MEMORY CHIPS. They're very sensitive to static electricity.

Hi cheyenne and welcome to the forum. As Al has said, check and be sure that the memory is fully seated. DO NOT FORCE IT, make sure it is properly lined up, if not, than it can be damaged. Also as the others have said, make sure the computer is off and the power cord is unplugged before doing anything inside and at the very least touch the metal case to ground yourself first if you don't have a grounding strap. You didn't post the Model number of your eMachines, so I am not sure if you have an update option. My last one T2824 was maxed out at 1 Gb DDR. This one, T5212, maxed out at 2 Gb DDR2. coastie65

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eMachines T5212.... Intel Pentium D 945 3.4Ghz..... evga 9800 GT 512 Mb PCI-E video card..... Realtec HD audio......2 Gb Crucial 667 Mhz DDR2 memory..... Lite on CD RW; DVD RW, DL,& Lightscribe optical drive...... Windows XP MCE 2005....... Antec Basiq 500w PSU......200 Gb Parallel ATA HDD.........Samsung 22" WS SyncMaster 2243BWX Monitor.